I've been anxiously awaiting the trial of this unit in our trailer:
http://www.amazon.com/gp/product/B000JNP7M4
400 watts, 1200 BTU, and no fan. It would make a great supplemental heater for the 'quiet' half...mine will go in front of the shower door.
You'll have to let it run, but this one won't pop your breakers on you.
It's running now at home and is completely silent.